Monoazo-dyestuffs



United States Patent MON OAZO-DYESTUFFS Hans Bolliger, Basel, Switzerland, assignor to Ciba Limited, Basel, Switzerland, a Swiss firm No Drawing. Application January 25, 1954, Serial No. 406,087

Claims priority, application Switzerland January 28, 1953 7 Claims. (Cl. 260-162) This invention provides valuable new monoazo-dyestuffs which contain at least one acylated sulfonic acid amide group and at least one group of the formula in which R represents an aliphatic radical, n represents a Whole number not greater than 2, and X represents a labile sulfur-containing substituent.

As labile substituents in the group of the Formula 1 there are to be understood sulfur-containing displaceable substituents which are easily split 01? in an alkaline medium along with the bonding electron pair, for example, a sulfuric acid ester group or above all a sulfonic .acid ester group. Advantageously the labile substituent is present in the 'y-position, or preferably the ,3-position, of the aliphatic radical R which is bound in the u-position through the -NH- group (n=2) or directly (n=1) to the SO2- group. The aliphatic radical R may contain further substituents such, for example, as a hydroxyl group. Especially valuable are the dyestuffs of the invention which contain as the group of the Formula 1 a or above all a sulfonyloxyalkyl-sulfonic acid amide group, for example, a p-(benzeneor toluene-sulfonyloxy)-ethyl sulfonic acid amide group.

In addition to a group of the latter kind the dyestuffs of the invention must contain at least one acylated sulfonic acid amide group, advantagesusly a group of the formula (2) SOzNH-acyl in which the acyl radical may be the radical of a very wide variety of acids, for example aliphatic or aromatic carboxylic acids, but more especially aliphatic or aromatic sulfonic acids. Thus, for example, the acyl radical may be an acetyl, n-butyryl, benzoyl, paratertiary-butylbenzoyl or para-chlorobenzoyl radical but more especially a sulfonyl radical, for example, the methane-sulfonyl, ethane sufonyl, n butane sulfonyl, benzene sulfonyl, naphthalene-p-snlfonyl, para-methyl benzene sulfonyl, orthoor para-chlorobenzene-sulfonyl or 2:5-dichlorobenzene sulfonyl radical.

The acylated sulfonic acid amide group and the group of the Formula 1 may be present in any desired positions in the dyestufl molecule, that is to say, one group of these two kinds may be present in the radical of a single component or one dyestufi component may contain, for example, the acylated sulfonic acid amide group and the other component the group of the Formula 1. Especially valuable are monoazo-dyestufis of this kind which contain the group of the Formula 1 in the radical of the diazo component and the acylated sulfonic acid amide group in the radical of the am component.

The dyestulis of the invention are advantageously prepared from dyestuff components which already contain the aforesaid groups. The dyestufi components used may of course contain further substituents, such, for example, as halogen atoms, nitro groups, acylamino, alkyl or alkoxy groups. However, it is of advantage to use diazo compounds which contain no hydroxyl group in ortho-position to the diazo group.

The dyestufl' components which contain an acylated sulfonic acid amide group can be made by methods in themselves known by acylating the corresponding unsubstituted sulfonic acid amide with any desired acid halide, for example, with an aliphatic or aromatic carboxylic acid chloride or advantageously with an aliphatic or aromatic sulfonic acid chloride. If necessary, any hydroxyl or amino group present in the product to be acylated may be protected or need not be present as such but in the form of a substituent convertible into such a group after the acylation. It is also possible in certain cases to use the corresponding sulfonic acids, instead of the corresponding non-acylated sulfonic acid amides, in Which case, after protecting any sensitive groups, for example, by acylation, the sulfonic acid group is converted in known manner into a sulfonic acid chloride group, the resulting sulfochloride is reacted with an aliphatic or aromatic amide to form the acylated sulfonic acid amide, and the protected groups are then re-formed.

As examples of suitable starting materials there may be mentioned:

A. Components containing an acylated sulfonic acid amide group, such as: Diazo compounds of l-aminobenzene-3- or 4-sulfonic acid N-acetylamide, 4-methylor 4-methoxy-l-aminobenzene-3-sulfonic acid N-benzoylamide, 1-aminobenzene-2-sulfonic acid N-(methane sulfonyl)-amide, l-aminobenzene-2- or -3- or -4-sulfonic acid N-(para-toluene-sulfonyl)-amide, Z-chloro-l-aminobenzene-S-sulfonic acid N-benzene sulfonyl amide, 4- methyl-l-aminobenzene-Z-sulfonic acid N-benzene sulfonylamide, 1-amino-2-methylbenzene-S-sulfonic acid N- benzene sulfonylamide or l-amino-2:6-dichlorobenzene- 4-sulfonic acid N-benzene sulfonylamide, and coupling components such as l-hydroxynaphthalene-4- or -5-sulfonic acid N-acetylamide, l-hydroxynaphthalenelor 5- sulfonic acid N-benzenesultonylamide, Z-hydroxynaphthalene-3-, -4-, -5-, -6-, -7- or -8-sulfonic acid-N-benzoylamide, 8-hydroxyquinoline-5-sulfonic acid N-(para-toluene sulfonyl)-amide, Z-aminonaphthalene-6-sulfonic acid-N-benzene sulfonylamide, Z-amino -8-hydronaph thalene-6-sulfonic acid N-(paratoluene sulfonyl)-amide, Z-arnino-8-hydroxynaphthalene-fi-sulfonic acid N-benzene sulfonyl-amide, 2-amino-8-hydroxynaphthalene-6sulfonic acid-N-(2':5'-dichlorobenzoyl)-amide, 1 (a naphthyl)-3- methyl-5-pyrazolone-4-sulfonic acid-N-acetylamide, 1-

- ethylamide,

chloro-4'-sulfonic acid N-benzene 'sulfonyl amide, 1 acetoacetylaminobenzene-2-, -3- or -4- sulfonic acid-N- benzoylamide, l-acetoacetylamino-benzene-2-, -3 or -4 sulfonic acid-N-benzene sulfonylamide.

The aforesaid pyrazolone coupling components may be prepared from arylamines containing an acylated sulfonic acid amide group by diazotizing such an amine, reducing the resulting diazo-compounds to a hydrazine, for example, by means of an alkali bisulfite or stannous chloride,.and. condensing; the hydrazine so. obtainedwith an acylacetic acid amide or with an acylacetic acid ester,

especially. acetoacetic acidmethyl or ethyl ester, the for mationof the pyrazolone being. completed without hydrolysis of. the acylated sulfonic acid amide group.

B. Componentswhich. contain a group of the above Formula-1 such asthe diazo-conripoundsv of the following amineszl-aminobenzene-4-sulfonic acid-;8-(ethane sulfonyloxy).-ethylamide,.1 aminobenzene-3- or -4-sulfonic acid-fi-(benzenesulfonyloxy)rethylamide, l-aminobenzene- 4-sulfonic acid-v-(benzene sulfonyloxy)-propylamide, 1- arninobenzene-4-sulfonic acid 'y. (para-toluenesulfonyloxy)propylamide, 4-methyl-l-aminobenzene 3 sulfonic acid-fl-(para-toluenesulfonyloxyyethylamide, 2:5-dichloro- 1 aminobenzen'e-4-sulfonic acid-,8-(benzenesulfonyloxy)- ethylamide, 2-methoxy-l-aminobenzene-S-fi-(para-toluenesulfonyloxy)-ethylsulfone, 1-aminobenzene-2-, -3- or -4- The. monoazo dyestuiisobtainable from the aforesaidcomponents are new and can' be made by coupling a diazo compound mentioned under A with a coupling component mentioned under. B or advantageously by. coupling a diazo compound: mentioned under B with a coupling componentrnentioned under A in ta not strongly alkal ne, and advantageously a neutral to acid, medium.

The resulting azo dyestufis contain at least one acylated sulfonic acid amide group and at least one group of theformula in which R represents an aliphatic radical, n represents a Whole number not greater than 2 and. X represents a labile sulfur-containing substituent. The dyestuffs ofthis constitution which-contain a group of the Formula 1 in which n isthe whole number 2, can be made by amethod other than by coupling, namely, by introducing the two.

groups, that is to say, the group of the Formula 1 in which n is the whole number 2, and the acylated sulfonic acid amide group into a finished dyestufr' free from these groups by. methods: in themselves. known which can be. used mutatis-mutandisfor introducingthesegroups into:

thedyestuff componentsmentioned above: FODthlSzPUI- pose, forexample, in accordance with the process ofPatenti No. 2,759,921 (application Ser. No.. 343,501, filed March.1-9,;1 953,.in U. S-. A. by Max Schmid and Rudolf Mory), a dyestutf .which contains two sulfonic acid. groups: maybe converted into the corresponding:disulfochloride, and .the. latter isthen.asymmetrically. amidated,,. that is. to say, amidated; in; such; manner that. one. ofathev sulfoehlw ride; groups iscrmverted,.for. example, .by. reaction withan acylamid into an acylated sulfonic acid amide group, and

-4'-sulfonic acid- 8-(benzenesulfonyloxy)-ethyl-- the other. sulfochloridegroup is..conver.ted,..for. example,

by reaction with a primary alkylamine containingap or 'y-sulfonyloxy group into a group of the Formula 1.

Those dyestuffs of the invention which contain a sul- V fonylated sulfonic acid amide group can be made veryadvantageously by reacting 1 mol of a dyestuff, which contains a -SO2NH2 group and an hydroxyalkyl sulfone group or a sulfonic acid N-hy droxyalkylamide group, with at least 2 mols of an organic sulfonic acid halide, for example, tosyl chloride, benzene sulfonylchloride or ethanev sulfonyl chloride, in such manner that the SO2NH2 group, on the one hand,.and th'e hydroxyl group of the sulfonic acid N-hydroxyalkylamide group or of the hydroxyalkylsulfone group, onthe other, are acylated.

Especially. valuable among thenew'dyestufiis of the invention are monoazo-dyestulfsof the formula in which R represents the radical of a diazo component of the naphthalene or advantageously the benzene series, B represents an aliphatic radical which contains in the fl .or v-position a sulfonyloxy group,- n represents a whole number not" greater than.2,. andlPz represents a 5-pyraz; olone radical which is bound to the azo linkage in 4-position andcontains in the 3 -position or advantageously in I the 1-position anarylradical substituted by an acylated sulfonic acid amide. group Advantageously. such monoazo-dyestuffs are vdevoidot free sulfonic acid and carbox ylic acid groups.

The dyestufis' of the-invention can be used for dyeing or printingvariousmaterials; especially nitrogenousnatural or artificial fibers. such: as leather, silk orwool, and also structures of. superpolyamidesor superpolyurethanes.

They. are suitable for dyeing from weakly acid to neutral.

baths. Dyeings: SO PIOdilCBd-l are level and are distin:

guished by their. goodfastness to light and remarkable;

fastness to. washing, fulling andalkalies.

As compared withthe. comparable dyestuffs hitherto" known, which contain an. acylated. sulfonic acid amide. group, the vdyestufrsof this invention have the advantage of yieldingdyeings oflmuch better fastness to washing,

and as. compared with the. comparable known dyestuffs whichicontain a fi-halogen-alkyl amide group the 'dyestufis: of' this. invention... are. distinguished by their enhancedaffinity whemapplied fromneutralbaths, and also by, their improvedfastnesszto washing.

The following. examples illustrate the invention, the parts and percentages. beingby weight unless otherwise. stated,- and the relationship of parts by weight to parts by volume being the same as that of the kilogram to the liter: 7

Example 1 38.5 -part'sgo fig hmethyh4+aminobenzene2sulfonic acid fi-(para-toluene; sulfonyloxy)+ethyl-amide' of the formulal NH:

(prepared-frontal; methyl. -:4 ac'etylaminobqnzene sulfonic acid. 5 hydroxyethy-lam'ide by reaction- Withpara-toluenesulfonio acid-chloride: and saponific'ation'of theiacetyl;radicalifrom tlie -acetylamino group) are diazotizedrin: 1'00. partsz oi water: and-25 parts of hydrochloric acid (density='-l .l'8. with 639 parts of sodium nitrite, and coupled-' with' a;- s'olution of? 40' parts of l phenyi s methyl-.i-pylfa blonefsulfonim acidf' Nbenzenesflibuybamideza-nd 3.0% parts ofi crystallinm sodium-acetate-M300 When the coupling is finished the dyeparts of water.

stuff formed, which in the form ofthe free acid corresponds to the formula somn-om-om-o-s til-Q0113 is salted out, filtered off and dried. There is obtained an orange-red powder which dissolves in water with a yellow coloration. It dyes wool from neutral to weakly acid baths pure yellow tints of excellent fastness to washing, fulling and light.

Example 2 40 parts of 1 methoxy 2 aminobenzene 4 sulfonic acid 5 (paratoluenesulfonyloxy) ethylamide of the formula I (obtained by reaction of l-methoxy-Z-acetylaminoben- OCH 0 l C SOz-N-SO I sown-om-om-o4 020cm in the form of the free acid. When dry it is a yellowred powder which dissolves in water with a yellow coloration and dyes wool from a neutral to weakly acid bath a pure yellow tint of excellent fastness to washing, fulling and light.

In the following table are given similar dyestufis which were obtained by the method described above from the diazoand coupling-components mentioned in columns I and II, and which dye wool from a neutral to Weakly acid bath the tints given in column III:

1 11 Diazo components Coupling components (llHs C=N\ 1 HzNC SOa-CHz-CH:OSO; /NOSOzNH-S0tyellow.

P 01 cm I I 2-.----" OzNH-CHs-CHz-O-SOz-QCHs I /N-C Do CH=C I soiNn-so OH l 01 cm I e=N I s soiNE-cHr-cm-o-sor-Qom /NC -SO2NHSO2O Do on=c I 01 on i 4 NH, N 01 Do o11=o y l SO2NHSO2 Cl OH SOzNHCHaCH:-OSOOOHs CH3 0cm I (J: 5 NH; I /NC SO2NHSO2CH1CH3 Do on somn-cm-cm-o-sm-Oom The pyrazolone's usedascoupling components. canbe prepared as follows: g

31.2 parts. of.-. 3'-aminobenzeneei.-sulfonic acid. N-bem zenesulfonylamide are. dissolved. int 125 parts. by. volume ofwater with thefaddition. of 5.3 parts ofi anhydrons. sodiumv carbonate.v After. the. addition of. 6.9 partsof sodiumv nitrite, the miiture is. introduced,. whilestirring vigorously, into amiirture of: 1010 parts. of ice and. 10 parts by. volumeoffsulfuricacid. ("density=l.8).. After 20 minutes the precipitated diazonium compound is rapidly filtered off, and introduced into arr ice-cold mixture of 45 parts by volume of aqueous sodium bisulfite containing 550 grams NaHSG3 per-liter; 22 parts by vo'lume of sodium hydroxide solution of 30*percent strength and 30 parts by volume of water. The whole is" stirred for one hour at -5' C; and then 0112 hours at 20 (3., heated to the boil, and 70 parts by volume of hydrochloric acid (density '1".18) are introduced dropwi'se in the course of /2 hour. After" being maintained for a further 20 minutes at 95 C. the mixture is cooled to 20.? C. andfiltered. ".Eh'e crystalline precipitate; which is the hydrazine; derivative, is dissolved: in: 150: parts by volume of water withthe additionof -.3 parts: of: anhydrous sodium carbonate. After introducing dropwise 13 parts by volume of acetoacetic acid ethyl ester, the whole is' heated at? the boil for one hour. At the: end of this period 18 parts by volume of hydrochloric acid (density=l.l8). are i-ntroduced-dropwise;-, and the mix?- ture is allowed to coolswhile-sst-irring; By filtering: off and drying the precipitate,= there is obtained-the desired 1 phenyl 3 methyl 5 pyrazolone 3 sulfonicacid-N-benzenesulfonylamide, which may be purified by recrystallization from a large quantity 'of water.

By using 31.2 parts of 4-amin'obenzen'e' sulfonic a'cidN- benzene sulfonylamide and otherwise proceeding in the same manner there is obtained 1-phenyl-3-methyl-5-pyrazolene4'-sulfonic acid N-benzenesulfonylamide.

From34.7 parts of 3'-amino'-4-'chlorobenzene-Psulfonic acid N-benzenesulfonylamide there is obtained by the same method 1-phenyl-3-n1ethyl-5-pyrazolone-2'-chloro- 5'-sulfonic acid N-benzenesulfonylamide, and from 38.1 parts of 4-amino-3:6-dichlorobenzene-l sulfonic acid N- benzenesulfonylamide there is obtainedlephenyl-3 methyl- S-pyrazolone-Z' 5-dichloro-4'-sulfonic acid N b enzene'sulfonylamide.

Example 3 0.5 part of the dyestufi obtainable as described inEx ample 1 is dissolved in 4000 parts of water, partsof crystalline sodium sulfate are added, and 100 parts of Well wetted wool are entered into the dyebath so obtained at 4050 C. 3 parts of acetic acid of 40' percent. strength are then added, the bath is raised to the boil in the course of /2 hour and dyeing is carried on at the boil for hour. Finally the wool is rinsed with cold water and dried. There is obtained a level yellow dyeing of good fastness to light and excellent fastness to washing.

A level yellow dyeing of good fastness to light and -excellentfastness to washing is likewise obtained by proceeding as described in this example, but without the addition of acetic acid to the'dyebath.

What is claime'dis:

1. A monoazo dyestufi free from sulfonic and carboxylic acid groups which corresponds to the formula wherein R1 represents a benzene radical, R2 represents the radical of a S-pyrazolonebound to the azo linkage in wherein R 1, R5; Y and Zeacli representswbenzene radical; R represents an alkyl radical of two carbon atomsbearing the substituent O-SOz-Y in fl-position, and mrepresents a whole number up to and including two.

3. The monoazo dyestuff of the formula Ha-C- l somn-om-om-o-sm-Qom 4. .The monoazo dyestufi of the formula 5. The monoazo dyestuff of the formula 10 7. The monoazo dyestufi of the formula 6. The monoazo dyestufi of the formula m H m m s N N m m m 4 0 O G e c 0 E E Q E m N l o m H 0 m 5 m m W m w 0 0 ml N N Q m E 0 OIIC CIC P n H C References Cited in the file of this patent UNITED STATES PATENTS 2,518,078 Schmidt et a1. Aug. 8, 1950 2,606,185 Widmer et a1. Aug. 5, 1952 

1. A MONOAZO DYSTUFF FREE FROM SULFONIC AND CARBOXYLIC ACID GROUPS WHICH CORRESPONDS TO THE FORMULA 